摘要： 以异佛尔酮二异氰酸酯(IPDI)和聚醚二元醇(N210、N220、N330)为基本原料，1，4-丁二醇(BDO)和 2，2 -二羟甲基丙酸(DMPA)为扩链剂，蓖麻油(C.O.)和三羟甲基丙烷(TMP)为交联剂，三乙胺(TEA)为中和剂合成了脂 环族水性聚氨酯预聚物。通过测定预聚物加水乳化过程中的黏度和电导率，研究了其相转变行为。结果表明:聚醚二 元醇相对分子质量、n(—NCO)∶n(—OH)值、羧基含量、中和度和交联剂用量对相转变有影响。聚醚二元醇相对分子 质量越大，羧基含量、中和度和交联剂用量的增加，相变点延后，n(—NCO)∶n(—OH)越小，相变点越滞后。通过测定 PU-H₂O体系相图得知，只有离子含量在 0.238 mmol/g 以上时才能得到贮存稳定性好的乳液

关键词: 水性聚氨酯, 脂环族, 乳化, 相转变

Abstract: Alicyclic aqueous polyurethane prepolymer was synthesized with isophorone diisocyanate(IPDI) and polyether diol (N210, N220, N330) as raw materials, 1,4-butanediol(BDO) and 2, 2-dimethylol propionic acid (DMPA ) as chain extenders, castor oil(C. 0. ) and trimethylolpropane as crosslinking agent, triethylamine(TEA ) as neutralization agent. Its phase inversion behavior was studied by determination of viscosity and conductivity during emulsification. The experimental results showed that several factors can affect the phase inversion heavily, including the molecular weight of polyether diol, the NCO/OH ratio，carboxyl and crosslinking agent content and neutralization degree. With the increasing of the molecular weight of polyether diol,carboxyl and crosslinking agent content and neutralization degree,and with the de-creasing of NCO/OH ratio, the phase inversion delays. By studying of the phase diagram of PU-H₂0 system it is known that the emulsion is not stable until the content of ion reaches above 0. 238 mmol/g.

Key words: aqueous polyurethane,  alicyclic,  emulsification, phase inversion